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.\" $FreeBSD: head/usr.bin/which/which.1 267773 2014-06-23 08:23:05Z bapt $
.\"
.Dd December 13, 2006
.Dt WHICH 1
.Os
.Sh NAME
.Nm which
.Nd "locate a program file in the user's path"
.Sh SYNOPSIS
.Nm
.Op Fl as
.Ar program ...
.Sh DESCRIPTION
The
.Nm
utility
takes a list of command names and searches the path for each executable
file that would be run had these commands actually been invoked.
.Pp
The following options are available:
.Bl -tag -width indent
.It Fl a
List all instances of executables found (instead of just the first one
of each).
.It Fl s
No output, just return 0 if all of the executables are found, or 1 if
some were not found.
.El
.Pp
Some shells may provide a builtin
.Nm
command which is similar or identical to this utility.
Consult the
.Xr builtin 1
manual page.
.Sh SEE ALSO
.Xr builtin 1 ,
.Xr csh 1 ,
.Xr find 1 ,
.Xr locate 1 ,
.Xr whereis 1
.Sh HISTORY
The
.Nm
command first appeared in
.Fx 2.1 .
.Sh AUTHORS
.An -nosplit
The
.Nm
utility was originally written in Perl and was contributed by
.An Wolfram Schneider Aq Mt wosch@FreeBSD.org .
The current version of
.Nm
was rewritten in C by
.An Daniel Papasian Aq Mt dpapasia@andrew.cmu.edu .
